Piezoelectric transformer with high effective electromechanical coupling factors

A piezoelectric transformer and electromechanical coupling technology, applied in the field of piezoelectric transformers, can solve the problems of low conduction and radiation, and achieve the effect of improving the ZVS coefficient

Inactive Publication Date: 2014-07-09
诺力克有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Also, since external magnetic components in the power converter are eliminated, there are no common external series or shunt inductors, resulting in lower levels of conducted and radiated EMI

Method used

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  • Piezoelectric transformer with high effective electromechanical coupling factors
  • Piezoelectric transformer with high effective electromechanical coupling factors
  • Piezoelectric transformer with high effective electromechanical coupling factors

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Embodiment Construction

[0047] Embodiments of the piezoelectric transformer of the present invention described in detail below are particularly suitable for power converters providing AC voltage amplification or boosting. For example, AC voltage amplification may be utilized to generate voltages above 2000 volts or even 6000 volts. Such high AC voltages are very useful for driving, for example, dielectric electroactive polymer actuators. However, those of ordinary skill in the art will understand that piezoelectric transformers according to the present invention are very useful for other types of applications in both step-up and step-down voltage conversion applications.

[0048] Figure 1 a) is a perspective view of a piezoelectric transformer 100 comprising an elongated piezoelectric ceramic body 102 adapted to operate in basal thickness mode. As indicated by a set of electric field arrows within input section 112 (see Figure 1B )), thickness mode operation is achieved by polarizing the central i...

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Abstract

The present invention relates to a piezoelectric transformer (100) comprising an elongate piezoelectric ceramic body (102) adapted to operate in fundamental thickness mode. The elongate piezoelectric ceramic body (102) comprises a central input or primary section (112) coupled to adjacently arranged first (114) and second (116) output sections. High power conversion efficiency and zero-voltage switching capability is achieved by providing a primary side effective electromechanical coupling factor keff_P, which is larger than a secondary side electromechanical coupling factor, keff_S.

Description

technical field [0001] The present invention relates to piezoelectric transformers comprising an elongated piezoelectric ceramic body adapted to operate in a base thickness mode. The elongated piezoceramic body includes a central input or primary portion coupled to adjacently arranged first and second output portions. By setting the primary side effective electromechanical coupling coefficient k eff_P Greater than the effective electromechanical coupling coefficient k of the secondary side eff_S , realizing high power conversion efficiency and zero voltage switching capability. Background technique [0002] Piezoelectric transformers are known as replacements for electromagnetic components in power converters such as AC-AC step-up or step-down converters, DC-DC step-up or step-down converters, or AC-DC step-up or step-down converters Taste. Because power conversion is based on the piezoelectric effect, piezoelectric transformers have several advantages over their magneti...

Claims

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Application Information

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IPC IPC(8): H01L41/107
CPCH10N30/40
Inventor 卡斯佩尔·辛丁·迈尔
Owner 诺力克有限公司
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